In the vast, frost-kissed expanses of seasonally frozen soils, a critical question looms for the energy sector: how much weight can a square section pile truly bear? Askar Zhussupbekov, a researcher from the Department of Civil Engineering at L.N. Gumilyov Eurasian National University, has delved into this very question, comparing different testing methods to determine the bearing capacity of piles in these challenging conditions.
The study, published in the journal *Smart Construction and Sustainable Cities* (translated from Russian as “Intelligent Construction and Sustainable Cities”), reveals significant variations in pile bearing capacity depending on the testing method employed. Zhussupbekov’s research highlights that dynamic load tests, such as the Pile Driving Analyzer (PDA) test, often yield higher ultimate capacities compared to static load tests (SLT), even after adjusting for safety factors.
“Our findings underscore the importance of choosing the right testing method for evaluating pile capacity in frozen soils,” Zhussupbekov explains. “The dynamic tests consistently showed higher capacities, which could have substantial commercial implications for the energy sector.”
The study compared three testing methods: SLT based on GOST standards, Cone Penetration Test (CPT), and PDA according to ASTM standards. The SLT indicated a bearing capacity of 1400 kN, which, after applying a safety factor of 1.2, resulted in an ultimate capacity of 1167 kN. The CPT, however, yielded a lower bearing capacity of 930 kN, which, after applying a safety factor of 1.25, resulted in an ultimate capacity of 744 kN—just 63.8% of the SLT value.
The PDA test, on the other hand, showed the highest bearing capacity, with an average of 1799 kN. After applying a safety factor of 1.4, the ultimate capacity was determined to be 1285 kN, which is 10% higher than the SLT value.
These findings could significantly impact the energy sector, where accurate pile capacity assessments are crucial for the safe and efficient construction of infrastructure in frozen soils. “By understanding the variations in testing methods, engineers can make more informed decisions, potentially reducing costs and enhancing the safety of their projects,” Zhussupbekov notes.
The research also opens the door for future developments in the field. As Zhussupbekov suggests, “Further studies could explore the reasons behind the discrepancies in testing methods and develop more accurate and reliable techniques for evaluating pile capacity in frozen soils.”
In the ever-evolving landscape of construction and sustainable cities, Zhussupbekov’s research serves as a reminder of the importance of rigorous testing and the potential for innovation in the field. As the energy sector continues to push the boundaries of infrastructure development in challenging environments, these insights could prove invaluable.